docs: def get_dividend_sum(book: Book, income_account: Account):
      """    Adds all distributions (income)    """
      splits = book.session.query(Split).filter(Split.account == income_account).all()
      dividend_sum = Decimal(0)
  
      for split in splits:
          dividend_sum += split.value
          # debug print split...
  
      # Since the income comes from the distribution account, it is marked as debit.
      return dividend_sum * (-1)